On the Band Structure of Bi2Te3
- Authors: Nemov S.A.1,2,3, Ulashkevich Y.V.4, Rulimov A.A.1, Demchenko A.E.1, Allahkhah A.A.1, Sveshnikov I.V.3, Dzhafarov M.5
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Affiliations:
- St. Petersburg Polytechnic University
- St. Petersburg Electrotechnical University LETI
- Transbaikal State University
- Ioffe Institute
- Azerbaijan Technical University
- Issue: Vol 53, No 5 (2019)
- Pages: 603-606
- Section: XVI International Conference “thermoelectrics and Their Applications–2018” (Iscta 2018,) St. Petersburg, October 8–12, 2018
- URL: https://journals.rcsi.science/1063-7826/article/view/206032
- DOI: https://doi.org/10.1134/S106378261905018X
- ID: 206032
Cite item
Abstract
For p-Bi2Te3 crystals grown by the Czochralski method, the temperature dependences of the conductivity, Hall coefficient, thermoelectric power (α), and transverse Nernst–Ettingshausen coefficient are obtained experimentally in the temperature range 77–450 K. The transmittance spectrum in the range 400–5250 cm–1 is recorded at room temperature. It is shown that, to interpret the temperature dependences of the scattering parameter r and the ratio of the thermoelectric power to temperature (α/T), it is essential to take into account the complex valence-band structure and the contribution of heavy holes to transport phenomena. Estimations of the energy band parameters in the context of the two-band model give a hole effective mass close to the free electron mass and the energy gap between nonequivalent extrema at a level of several hundredths of eV. In the absorption spectrum derived from the transmittance spectrum, a sharp increase in absorption defined by indirect interband transitions with the band gap Eg ≈ 0.14 eV is observed in the region of frequencies ν ≥ 1000 cm–1. The absorption spectrum calculated from the reflectance data using the Kramers–Kronig relations is in agreement with the experimental absorption spectrum.
About the authors
S. A. Nemov
St. Petersburg Polytechnic University; St. Petersburg Electrotechnical University LETI; Transbaikal State University
Email: rulimmmov@gmail.com
Russian Federation, St. Petersburg, 195251; St. Petersburg, 197022; Chita, 672039
Yu. V. Ulashkevich
Ioffe Institute
Email: rulimmmov@gmail.com
Russian Federation, St. Petersburg, 194021
A. A. Rulimov
St. Petersburg Polytechnic University
Author for correspondence.
Email: rulimmmov@gmail.com
Russian Federation, St. Petersburg, 195251
A. E. Demchenko
St. Petersburg Polytechnic University
Email: rulimmmov@gmail.com
Russian Federation, St. Petersburg, 195251
A. A. Allahkhah
St. Petersburg Polytechnic University
Email: rulimmmov@gmail.com
Russian Federation, St. Petersburg, 195251
I. V. Sveshnikov
Transbaikal State University
Email: rulimmmov@gmail.com
Russian Federation, Chita, 672039
M. Dzhafarov
Azerbaijan Technical University
Email: rulimmmov@gmail.com
Azerbaijan, Ganja, AZ1148